[IMP] iot: Dual screen support for RPI4

We now support the RPI4 which has 2 micro-HDMI outputs, while the
prvious driver only supported one display. We add support for a second
display.

Taskid: 2123511
X-original-commit: 5886c3a864c990fcd7b852baafab752e7da90494

addons/hw_drivers/controllers/driver.py

@@ -6,7 +6,7 @@ from usb import core
 from gatt import DeviceManager as Gatt_DeviceManager
 import subprocess
 import json
-from re import sub
+from re import sub, finditer
 import urllib3
 import os
 import socket
@@ -302,14 +302,20 @@ class Manager(Thread):
 
     def get_connected_displays(self):
         display_devices = {}
-        hdmi = subprocess.check_output(['tvservice', '-n']).decode('utf-8').replace('\n', '')
-        if hdmi.find('=') != -1 and hdmi.split('=')[1] != "Unk-Composite dis":
-            hdmi_serial = sub('[^a-zA-Z0-9 ]+', '', hdmi.split('=')[1]).replace(' ', '_')
+
+        displays = subprocess.check_output(['tvservice', '-l']).decode()
+        x_screen = 0
+        for match in finditer('Display Number (\d), type HDMI (\d)', displays):
+            display_id, hdmi_id = match.groups()
+            display_name = subprocess.check_output(['tvservice', '-nv', display_id]).decode().rstrip().split('=')[1]
+            display_identifier = sub('[^a-zA-Z0-9 ]+', '', display_name).replace(' ', '_') + "_" + str(hdmi_id)
             iot_device = IoTDevice({
-                'identifier': hdmi_serial,
-                'name': hdmi.split('=')[1],
+                'identifier': display_identifier,
+                'name': display_name,
+                'x_screen': str(x_screen),
             }, 'display')
-            display_devices[hdmi_serial] = iot_device
+            display_devices[display_identifier] = iot_device
+            x_screen += 1
 
         if not len(display_devices):
             # No display connected, create "fake" device to be accessed from another computer

addons/hw_drivers/drivers/DisplayDriver.py

@@ -35,8 +35,9 @@ class DisplayDriver(Driver):
         self.event_data = threading.Event()
         self.owner = False
         self.rendered_html = ''
-        self.load_url()
-        self.call_xdotools('F11')
+        if self.device_identifier != 'distant_display':
+            self._x_screen = device.get('x_screen', '0')
+            self.load_url()
 
     @property
     def device_identifier(self):
@@ -68,20 +69,22 @@ class DisplayDriver(Driver):
             event_manager.device_changed(self)
 
     def run(self):
-        while True:
+        while self.device_identifier != 'distant_display':
             time.sleep(60)
             if self.url != 'http://localhost:8069/point_of_sale/display/':
                 # Refresh the page every minute
                 self.call_xdotools('F5')
 
     def update_url(self, url=None):
+        os.environ['DISPLAY'] = ":0." + self._x_screen
+        os.environ['XAUTHORITY'] = '/run/lightdm/pi/xauthority'
         firefox_env = os.environ.copy()
-        firefox_env['HOME'] = '/tmp'
-        firefox_env['DISPLAY'] = ':0.0'
-        firefox_env['XAUTHORITY'] = '/run/lightdm/pi/xauthority'
+        firefox_env['HOME'] = '/tmp/' + self._x_screen
         self.url = url or 'http://localhost:8069/point_of_sale/display/'
-        if self.device_identifier != 'distant_display':
-            subprocess.Popen(['firefox', self.url], env=firefox_env)
+        new_window = subprocess.call(['xdotool', 'search', '--onlyvisible', '--screen', self._x_screen, '--class', 'Firefox'])
+        subprocess.Popen(['firefox', self.url], env=firefox_env)
+        if new_window:
+            self.call_xdotools('F11')
 
     def load_url(self):
         url = None
@@ -101,10 +104,10 @@ class DisplayDriver(Driver):
         return self.update_url(url)
 
     def call_xdotools(self, keystroke):
-        os.environ['DISPLAY'] = ":0.0"
+        os.environ['DISPLAY'] = ":0." + self._x_screen
         os.environ['XAUTHORITY'] = "/run/lightdm/pi/xauthority"
         try:
-            subprocess.call(['xdotool', 'search', '--sync', '--onlyvisible', '--class', 'Firefox', 'windowactivate', 'key', keystroke])
+            subprocess.call(['xdotool', 'search', '--sync', '--onlyvisible', '--screen', self._x_screen, '--class', 'Firefox', 'key', keystroke])
             return "xdotool succeeded in stroking " + keystroke
         except:
             return "xdotool threw an error, maybe it is not installed on the IoTBox"

addons/point_of_sale/tools/posbox/overwrite_after_init/etc/X11/xorg.conf

@@ -0,0 +1,60 @@
+Section "Device"
+    Identifier  "fbdev0"
+    Driver      "fbdev"
+    Option      "fbdev" "/dev/fb0"
+EndSection
+
+Section "Device"
+    Identifier  "fbdev1"
+    Driver      "fbdev"
+    Option      "fbdev" "/dev/fb1"
+EndSection
+
+# Dummy device to use Xlib in KeyboardUSBDriver when no monitor is connected
+Section "Device"
+    Identifier  "dummy"
+    Driver      "dummy"
+EndSection
+
+Section "Monitor"
+    Identifier  "Monitor0"
+EndSection
+
+Section "Monitor"
+    Identifier  "Monitor1"
+EndSection
+
+Section "Monitor"
+    Identifier  "DummyMonitor"
+EndSection
+
+Section "Screen"
+    Identifier  "Screen0"
+    Monitor     "Monitor0"
+    Device      "fbdev0"
+    Subsection  "Display"
+    EndSubSection
+EndSection
+
+Section "Screen"
+    Identifier  "Screen1"
+    Monitor     "Monitor1"
+    Device      "fbdev1"
+    Subsection  "Display"
+    EndSubSection
+EndSection
+
+Section "Screen"
+    Identifier  "DummyScreen"
+    Monitor     "DummyMonitor"
+    Device      "dummy"
+    Subsection  "Display"
+    EndSubSection
+EndSection
+
+Section "ServerLayout"
+    Identifier  "Multihead"
+    Screen 0    "Screen0"
+    Screen 1    "Screen1" rightof "Screen0"
+    Screen 2    "DummyScreen" rightof "Screen1"
+EndSection

addons/point_of_sale/tools/posbox/overwrite_after_init/etc/lightdm/lightdm.conf

@@ -3,6 +3,6 @@
 user-authority-in-system-dir=true
 
 [SeatDefaults]
-xserver-command=/usr/bin/X -s 0 dpms -nolisten tcp
+xserver-command=/usr/bin/X -s 0 -layout Multihead dpms -nolisten tcp
 greeter-hide-users=false
-autologin-user=pi
+autologin-user=pi

addons/point_of_sale/tools/posbox/overwrite_before_init/etc/init_posbox_image.sh

@@ -50,6 +50,7 @@ PKGS_TO_INSTALL="
     xdotool \
     unclutter \
     x11-utils \
+    xserver-xorg-video-dummy \
     openbox \
     rpi-update \
     adduser \
@@ -159,6 +160,9 @@ systemctl disable hostapd.service
 # cf: https://www.raspberrypi.org/documentation/configuration/raspi-config.md
 echo "disable_overscan=1" >> /boot/config.txt
 
+# Separate framebuffers for both screens on RPI4
+sed -i '/dtoverlay/d' /boot/config.txt
+
 # exclude /drivers folder from git info to be able to load specific drivers
 echo "addons/hw_drivers/drivers/" > /home/pi/odoo/.git/info/exclude
 

addons/point_of_sale/tools/posbox/overwrite_before_init/home/pi/.xsession

@@ -0,0 +1,5 @@
+# Start Openbox on the second display as described in 
+# http://openbox.org/wiki/Help:FAQ > "How do I run Openbox across multiple X screens?"
+
+XAUTHORITY=/run/lightdm/pi/xauthority DISPLAY=:0.1 openbox & 
+exec openbox-session